If you or others need a rottisorie, maybe these will be of interest?
I made these from 50 mm box steel and cost about £70 in materials alone.

They are welded up so the caddy is held slightly over centre - please note I facked up the angle cuts on the bottom of the stand, and the brace is in a different place to drawings - please follow the drawings (I didn't!)

Cut the box up as follows..and weld together

And make the mounts as shown..

I bolted the mounts up to the car, then offered the front frame up so there would be just enough gap between bottom of stand and wing (about 1" with a mate stood holding a 1" plank against the car.) I then tacked it in place and then did the same to the back frame.
I unbolted the lot and welded it all up at work good and solid.
To lift the car I just slide a bar in one of the frames to make a lever and lift - I can do it on my own no probs.
To drop it down again, you need two as its impossible to push the car from one side and hold it on the other side on your own.
It is dead easy with two though.